| Main Entry: | X factor |
| Part of Speech: | n |
| Definition: | a hard-to-describe influence or quality; an important element with unknown consequences; also written X-factor |
| Example: | The new center on the basketball team is the X factor. |
| Etymology: | 1934 |
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| the offspring of a zebra and a donkey. |
| a gadget; dingus; thingumbob. |